Hot-air furnace



J. l. QUARMBY'AND E. JVAND S. R. EWING.

HOT AIR FURNACE.

APPLICATION FILED APR. 18. 1919.

1,384,635. Patented July 12, 1921.

A 2 SHEETS-SHEET 2;

a 2 J. 1. 01401272 by Smwwcou wanna;

TAT-ES IJJ'ONATHAN 1- our, mm. .1.

rrENr OFFICE.

EWING, AND SAMUEL n. Ewme, or mnsme; mcmcm.

"nor-Am FURNACE.

naces, of which the following-is aspecifica' tion.

This invention relates to furnaces and more particularly to means for regulating a fire by providing an apparatus especially designed for use in connection with heating furnaces.

An object of the invention is to provide an apparatus to be used in connection with fur naces for supplying pro-heated air to the fire box to aid combustion, which results in a material reduction in the amount of fuel consumed for a given amount of heat, thereby reducing the cost of operation.

Another object is to provide means for quickly starting a fire and for quickly ext nguishing the same, so that when desired a high temperature may be obtained in a veg; short time.

her objects and advantages of the in-' vention will appear as the following description is read in connection with the accompanying draw ngs.

in the drawings Figure 1 is a view artly in section and partly. in elevation, il ustrating the invenlilOIl. I "2'1" v Fig, 2 is an enlargedsectional view taken through the suction or mixing chamber illustrating the manner of forcing the pro-heated air into the furnace.

Fig. 3 is an enlarged sectional view on the line 3-3 of Fig. 1.,

Fig. 4 is a detail perspective view of the hot air drum.

Fig. 5 is a sectional view through the hot air drum illustrating the moisture or water tank therein, the section being taken ona line with the smoke pipe.

Fig. 6 is an enlarged sectional viewv through the suction chamber, the section being at right .to the one shown in Fifi 2. p I I eferring to the drawings in detail, like characters vpf reference denote corresponding garts throughout the several views.

e invention is illustrated as applied to a furnace of the hot-air type, but it is un-- I Specification of Letters Patent.

which leads from the furnace to the flue 19.

lation of air. 23, is a receptacle 23 which is adapted to Patented Jul 12, 1921.

Application filed April 18, 1919. Serial No. 291,084.

derstood thatthe invention may also be used in connection with other types of furnaces or stoves. The furnace, which is shown at 10, Includes the usual fire box11,ash pit 12- and dome 13. The fire box is provided with the usual door 14: and the ash pit with a door 15, having therein the usual damper 16, the latter being controlled through the medium of a chain or cable 17, leading to some convenient point. 18 indicates a smoke pipe,

the said pipe being equipped with a damper 20, which is controlled by a chain or cable 21. Cold air is supplied to the furnace so as to promote combustiomszni for this purpose there is provided the usual cold air intake 22, which communicates with the inter1or of the furnace through the ash pit and beneath the fire box.

All of the foregoing construction may be of the, usual or any preferred type, the invention residing in supplying pro-heated air and moisture to the interior of the furnace. For this purpose there is located upon the smoke pipe 18, a heating drum 23, the walls of this drum surrounding the pi e and being spaced from. the latter to provi e for circu- Positioned within the drum contain water, so that the heat within the drum 23 will vaporize the water and cause it to mix with the air.

Locatedrnear the bottom of the furnace is a combined suction and drum 25, the latter communicating with the interior of the drum 23 through the medium of a pipe'26. The drum 25 is also in communication with the cold air intake through the medium of a pipe 27, which forms a continuation of the pipe 26 and extends from the opposite side of the hot air drum 23. By this means cold air will be admitted through the pipe 27 and will enter the drum 23 where it Wlll become heated and moistened by the water in the receptacle 23, and pass throu h the pipe 26 into the drum 25, where it wil be fed to the furnace through the lower rear end thereof.

To provide for drawing in the heated air 7 from the drum 23 and forcing the same into the furnace, there isprovided a motor .28, which is mounted within a casing 28, and is included in an electric circuit 29, havin a suitable source of electric energy 30 an a push button 31, by means of which the motor ill? . to the interior of the combined mixing and is controlled. The motor 28 is designed to operate a fan 32,- which is mounted upon a shaft 32*, located within the chamber 25,-the said shaft being driven by a belt 32 from the motor. The heated air is forced bythe fan through a short pipe section'33 into the furnace chamber and rises upward and circulates around the fire box 11 and the dome 13 before passing through the openings 34 into the distributing pipes. The heated air is thus caused to travel through all of the distributing pipes in an evenvolume, the distribution of heat being assured irrespective of the angle or length of the distributing pipes. By locating the button 31 at a convenient point, the motor 28 may be operated,

when desired, to force the flow of air through the pipes. I

The short pi e 33 is controlled by a damper 35, the latter eing hinged, as indicated at 36, so as to obstruct the passage of air upward around the outside of the, firebox,

when desired, this damper being normally urged to an open position through the medium of a spring 37. A chain or cable 38 has one end connected to the damper 35 and passes over pulleys 39 to some convenient point of'operation. In order to gain access suction chamber, there is rovided a door 40, located in the top thereo To revent the ashes from being blown throu the door 15 of the ash pit, there is provi ed a pipe 41, whiclt communicates with the short pipe section 33 to direct the draft upward through the fire box when the damper 35 is properly regulated.

It is believed that when the fore oing .description is read in connection wit the accompanying drawing, the construction, operation and advantages of the invention will be apparent. I

Various chan es may be made in the form,

5 minor details of construc-.

tion and the right is herein reserved to make proportions an such changes as roperly fall within the scope of the appen ed claims.

Having described the invention, what is claimed 1s: 1. A hot air furnace of the class described comprising a smoke pipe leading therefrom,

a heating drum mounted upon said smoke pipe, a cold air intake pipe passing through sa1d drum, a drum connected with said intake pipe, a firebox contained within said furnace, a motor mounted within a casing to provide for drawing heated air therefrom, and forci .same intothe furnace, a shaft located wit in said chamber, a belt rovidlocated wit in said chamber, a belt provided on said motor for drivin said shaft, a fan mounted u onsaid shaft located within said drum, a s ort pipe section mounted upon said shaft located within said drum, a retacle positioned within said drum and co adapted to contain water so that the heatwithin the drum will vaporize the-water and cause same to mix with the air, a damper controllin said short pipe section so as'to obstruct te'air upward around the, outside of the fire box when desired, a spring for normally urging the damper to an open position, and a pipe communicating with said short pipe section for directing the draft upward through the fire box when the said damper is properl regulated.

In testimony w ereof we affix oursignatures.

' JONATHAN I. QUAR-MBY. EA'RL J. EWING. SAMUEL R. EWING.

through 

